Malicious PDF — malware analysis report

Static analysis result for SHA-256 1595948134057cae…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 01:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ffad35f1c6a122b4a571f9730c5d4d6e SHA-1: 74168b83f95106469beeddb7de4be53b22e4e211 SHA-256: 1595948134057caea2b6a726326d6541c25f1e27fec20b86ddfd8c25cf47daaa
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a strong intent to redirect users to potentially harmful sites. The presence of external URIs and the ML classification strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=mod+apk+turboprop+flight+simulator+3d PDF link annotation
    • http://champagne-marc-chauvet.com/images/files/wuwimepowudejufiv.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091520195673499.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/datagimibenejujimuri.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/92284025375.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613140f9b6eea---13240125445.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/65571371048.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210914053112.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/nudovazikazufazoperuwava.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/nogobumokefid.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/67149888981.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/89716395367.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/28317206208.pdfIn PDF document text
    • https://olterus.net/contents/files/renem.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/buzolosanaridofomelarevi.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/gubogamisezu.pdfIn PDF document text
    • http://furniture83.com/upload/files/puzebipetilagigonezifime.pdfIn PDF document text
    • http://elitk.ru/_files/sutidixigeropefa.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/kibipajuguv.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/52910967785.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e84c160e84---38305710042.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/lotabapukizebapete.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/niwumufamugofu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC016 11208 bytes
SHA-256: 713c40e711d0b51ce6716b7ff3ff6650ab9fc0ab0d3fb9f9527e8d36ac4c37e2
font_01_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 16492 bytes
SHA-256: 0169a64ddc5644e439f0b019259176e8f84ef771c54c6e68e31c9782e5205d2f

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